Ring binder having a torsionally stiffened blade



FIG. 1 is a side elevational view of a ring binder, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a bottom plan view of one blade of the binder shown separately for ease of illustration; and,

FIG. 5 is a sectional view taken on the plane 5—5 in FIG. 4. 

The ornamental design for ring binder having a torsionally stiffened blade, as shown and described. 